SMD and COB are two packaging methods for LED displays. 

There are similarities but also differences between them. LEGIDATECH explains it in detail. 

1. Process introduction SMD is known as surface mounted devices, meaning surface mounted devices.

The light emitting chips (wafers) are encapsulated into individual lamp beads, which are then soldered to the PCB board to form a unit module, and finally spliced together to form the whole LED screen

IP ratings on LED displays are important to ensure the right product is selected for the application and environment. Selecting an LED panel with the correct IP rating will ensure the display is protected from the environmental elements and will perform as expected. The danger of selecting a product with an inadequate rating is completing an install and then experiencing operation issues and permanent damage.

IP stands for International Protection Rating, commonly called Ingress Protection Rating. It is defined in the international standard IEC 60529 as the degree of protection against the intrusion of solid objects, dust, accidental contact, and water in electrical enclosures.

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